CVE-2002-20001
The Diffie-Hellman Key Agreement Protocol allows remote attackers (from the client side) to send...
The Diffie-Hellman Key Agreement Protocol allows remote attackers (from the client side) to send arbitrary numbers that are actually not public keys, and trigger expensive server-side DHE modular-exponentiation calculations, aka a D(HE)at or D(HE)ater attack. The client needs very little CPU resources and network bandwidth. The attack may be more disruptive in cases where a client can require a server to select its largest supported key size. The basic attack scenario is that the client must claim that it can only communicate with DHE, and the server must be configured to allow DHE.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
The Diffie-Hellman Key Agreement Protocol allows remote attackers (from the client side) to send arbitrary numbers that are actually not public keys, and trigger expensive server-side DHE modular-exponentiation calculations, aka a D(HE)at or D(HE)ater attack. The client needs very little CPU resources and network bandwidth. The attack may be more disruptive in cases where a client can require a server to select its largest supported key size. The basic attack scenario is that the client must claim that it can only communicate with DHE, and the server must be configured to allow DHE.
- Record
CVE-2002-20001- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-400
- Updated
- 2026-11-02
CVE List No score
The Diffie-Hellman Key Agreement Protocol allows remote attackers (from the client side) to send arbitrary numbers that are actually not public keys, and trigger expensive server-side DHE modular-exponentiation calculations, aka a D(HE)at or D(HE)ater attack. The client needs very little CPU resources and network bandwidth. The attack may be more disruptive in cases where a client can require a server to select its largest supported key size. The basic attack scenario is that the client must claim that it can only communicate with DHE, and the server must be configured to allow DHE.
- Record
CVE-2002-20001- Updated
- 2026-11-02
EUVDEUVD-2002-1979 No score
The Diffie-Hellman Key Agreement Protocol allows remote attackers (from the client side) to send arbitrary numbers that are actually not public keys, and trigger expensive server-side DHE modular-exponentiation calculations, aka a D(HE)at or D(HE)ater attack. The client needs very little CPU resources and network bandwidth. The attack may be more disruptive in cases where a client can require a server to select its largest supported key size. The basic attack scenario is that the client must claim that it can only communicate with DHE, and the server must be configured to allow DHE.
- Record
EUVD-2002-1979- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-jx4r-qc68-xjr5
The Diffie-Hellman Key Agreement Protocol allows remote attackers (from the client side) to send...
The Diffie-Hellman Key Agreement Protocol allows remote attackers (from the client side) to send arbitrary numbers that are actually not public keys, and trigger expensive server-side DHE modular-exponentiation calculations, aka a D(HE)ater attack. The client needs very little CPU resources and network bandwidth. The attack may be more disruptive in cases where a client can require a server to select its largest supported key size. The basic attack scenario is that the client must claim that it can only communicate with DHE, and the server must be configured to allow DHE.
- Record
GHSA-jx4r-qc68-xjr5- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-400
- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:11905-1 No score
libopenssl-1_1-devel-1.1.1m-4.1 on GA media
These are all security issues fixed in the libopenssl-1_1-devel-1.1.1m-4.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:11905-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:13932-1 No score
ssh-audit-3.2.0-1.1 on GA media
These are all security issues fixed in the ssh-audit-3.2.0-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:13932-1- Updated
- 2026-11-02
Affected products
- balasys dheater
- f5 big-ip access policy manager
- f5 big-ip advanced firewall manager
- f5 big-ip advanced web application firewall
- f5 big-ip analytics
- f5 big-ip application acceleration manager
- f5 big-ip application security manager
- f5 big-ip application visibility and reporting
- f5 big-ip carrier-grade nat
- f5 big-ip ddos hybrid defender
- f5 big-ip domain name system
- f5 big-ip edge gateway
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- f5 big-ip fraud protection service
- f5 big-ip global traffic manager
- f5 big-ip link controller
- f5 big-ip local traffic manager
- f5 big-ip policy enforcement manager
- f5 big-ip service proxy
- f5 big-ip ssl orchestrator
- f5 big-ip webaccelerator
- f5 big-ip websafe
- f5 big-iq centralized management
- f5 f5os-a
- f5 f5os-c
- f5 traffix signaling delivery controller
- hpe arubaos-cx
- siemens scalance w1750d firmware
- stormshield management center
- stormshield network security
- suse linux enterprise server
Affected packages
| Package | Affected | Fixed |
|---|---|---|
openssl-1_1openSUSE:Tumbleweed |
before 1.1.1m-4.1 | 1.1.1m-4.1 |
ssh-auditopenSUSE:Tumbleweed |
before 3.2.0-1.1 | 3.2.0-1.1 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | c0r0n3r/dheater | 2021-08-31 |
| PoC in GitHub | itmaniac/dheat_dos_attack_poc | 2025-07-28 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2002-20001 is a high vulnerability (CVSS 7.5) in Balasys Dheater, published November 11, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 24.6%, the 97th percentile. Fixed in openssl-1_1 1.1.1m-4.1.
References
github.com/Balasys/dheater
researchgate.net/profile/Anton-Stiglic-2/publication/2401745_Security_Issues_in_the_Diffie-Hellman_Key_Agreement_Protocol
reddit.com/r/netsec/comments/qdoosy/server_overload_by_enforcing_dhe_key_exchange
cert-portal.siemens.com/productcert/pdf/ssa-506569.pdf
suse.com/support/kb/doc?id=000020510
Show 10 moreShow less
openssl.org/blog/blog/2022/10/21/tls-groups-configuration
arubanetworks.com/assets/alert/ARUBA-PSA-2022-004.txt
support.f5.com/csp/article/K83120834
dheatattack.com
gitlab.com/dheatattack/dheater
dheatattack.gitlab.io
ieeexplore.ieee.org/document/10374117
nvd.nist.gov/vuln/detail/CVE-2002-20001